doc: provide force DFU method
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README.md
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README.md
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@ -99,6 +99,23 @@ The main application needs to implement the runtime mode separately.
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To switch from runtime to DFU mode during detach, set the boot partition in `otadata` to `factory`, and restart the ESP.
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force DFU
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---------
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The USB DFU firmware does not act as bootloader.
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Meaning, the ESP bootloader does not start the USB DFU firmware, which in turn starts the main firmware.
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The main firmware in the OTA0 partition is directly loaded by the ESP bootloader.
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Thus is it up to the main firmware to start the DFU mode, as described in `runtime`.
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In case the main firmware is defective, and does not allow to switch back to DFU mode, you can still force booting the USB DFU firmware.
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For that, boot the ESP ROM bootloader (i.e. download mode), and invalidate the OTA data partition:
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~~~
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otatool.py --esptool-args after=no_reset_stub --port /dev/ttyACM0 erase_otadata
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~~~
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When restating the ESP by pressing the reset button, the ESP bootloader will start the firmware which is in the factory partition, which should be the DFU firmware previously flashed.
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design choice
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=============
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